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See the blocks · Hear the tones · Feel the buzz. Pick numbers, then tap Feel it.
Feel mode uses big A & B pickers (1–12). Calc mode is a simple digit pad, with the same sensory scene when the numbers fit.
Operation
For subtraction, A must be ≥ B.
0
Two numbers only, then =. Backspace erases a digit. Keyboard works on desktop. Feel scenes light up when both are 1–12. No scientific keys.